Suspending device for conducting cables



g- 4, 1931- w. HOFMANN 1,817,313

SUSPENDING DEVICE- FOR CONDUCTING CABLES Filed Dec. 20. 1929 2 Sheets-Sheet 1 4, 1931. J. w. HOFMANN 1,817,313

SUSPENDING DEVICE FOR CONDUCTING CABLES Filed Dec. 20. 1929 I 2 Sheets-Sheet 2 Patented Aug. 4, 1931 UNITED STATES PATENT OFFICE SUSPENDING DEVICE FOR CONDUCTING CABLES- Application filed December 20, 1929, Serial No. 415,450, and in Germany February 26, 1929.-

This invention relates to a suspending devlce for conducting cables, according to which the fastening of the conducting cable is efiected by means of arms jointedly conniected with the carrying means of the hanging chain or of the insulator chain, to which arms are jointedly connected the clamping devlces or the additional clamps serving as carrying surfaces for the conducting cable in such a manner that the oscillations occurring in the conducting cable cannot pass through the suspending device without hindrance.

To enable this, according to the invention the carrying plates on the carrying means and the clamping device on the carrying plates are pivotally mounted with their respective axes in the middle-line or as near as possible to the middle-line of the cable, so that sald axes will come to lie substantially in a horizontal plane through the middle-line of the cable.

Thus it results that the larger undulations pass through the suspending device Without hindrance in such a manner that the entire suspending device will pivot around the middle axis, whereas the smaller undulations will efiect a swinging of the clamping device or clamping parts around the axes in the carrying plates.

On the drawings the invention is shown by way of example in one mode of construction.

Fig. 1 shows the suspending device in side elevation, and

Fig. 2 is a top plan view, while 85 Fig. 3 shows on an enlarged scale the clamping device proper or the clamping-part with the pivoting point at the carrying flap.

Figs. 4: and 5 show in side elevation and in top plan view, respectively, a modification of? the invention.

As will be seen by the drawings, Figs. 1, 2 and 3, 0 are the carrying plates pivotally mounted by means of the pin 6 on the carrying member h. On these carrying plates 0 there are arranged in a well known manner the clamping devices or the clamping parts an pivotally secured by means of the bolts or pins dd.

According to the invention the middle pin e and the two bolts or pins dd of the clamping parts cm on the carrying flaps c are situated in the middle line or as near as possible to the middle line of the conducting cable I), and so will lie in one plane.

Thus the advantage is obtained that the larger oscillations will pass without hindrance through the suspending device in such a manner that the entire suspending device will swing around the axis 6, whereas the smaller oscillations will effect a swinging of the clamping device or clamping parts aa around the axes dd in the carrying plates 0.

For the purpose of enabling the clamping parts aa to easily follow the oscillations having short undulations, the clamping parts cm are suspended on the carrying plates 0 with their axes old so arranged that each axis (l is a shorter distance from the inner end f of the clamping part than from the outer end 9', so that the longer lever arm 11 is directed towards the arriving cables, as shown in Fig. 3. The oscillations having short undulations thus cause a movement of the longer lever arm 2' of the clamping parts which corresponds to a smaller movement of the shorter lever arm 70, whereby the raising and lowering of the portion of cable If, lying between the clamping parts, isefl'ected to only a small extent.

By an appropriate, for instance curved, formation of the carrying surfaces of the shortercarrying arm 70 of the clamping part the result may be obtained that said shorter carrying arm will make a rolling movement on the .portion of the conductor lying between the clamping parts, without any friction on the cable.

For the purpose of enabling an adjustment of the clamping members in relation to the slope of the cable as well as to its oscillations, there may be turnably suspended from the carrying members of the insulating chain a mould-like receptacle for receiving the cable, whereas from said mould there are pivotally suspended the carrying arms, jointly receiving the clamps and being formed in the shape of plates.

As will be seen by Figs. 4 and 5 of the drawings, the carrying plate formed as a mould a is pivotally secured to the carrying member 5 tion of the clamping parts at or a'a around produce very h of the insulator chain by means of a bolt or pin e, the radius r'of the mould being equal to or larger than the smallest admissible bending radius of the cable used. To the mould 71. there are turnably fixed by means of bolts or pins mm the carrying arms ,c'c' formed as plates, whereas to said carrying arms the clamps aav are hingedly fixed by means of the bolts or pins dd.

The bolt or pin e will lie with its axis in the middle of the mould and on a level with the middle'of the conductor. The pins or bolts mm of the plates 0'0 will lie adjacent to the bolt or pin 6 and will also have their axes on a level with the middle of the conductor. The clamps a/a are hingedly connected with the mould n by means of the carrying arms or plates 0'0. The clamps aa will consequently automatically adjust themselves owing to their turnability around the pins or bolts dd and owing to the connection of the carrying arms or plates 0'0 with the mould n, from which they extend in the direction of ,the cable-slope. The clamps a'a' serve mainly to clamp the conducting cable, so as to'prevent an undesirable sliding thereof due to a one-sided or uneven pull of the cable.

The conducting cable I) will, acording to its smaller or larger slope, repose on a smaller or larger part of the mould n. The bending radius 1- of the suspension arc reaching from the one side of the suspending device to the other will always remain the same.-

. In Fig. 4 a second position of the conductlng cable and the clamping part on a smaller slope is shown in dotted lines.

, The larger oscillations of the cable 6 pro duced by mechanical vibrations will effect a turning motion of the entire suspending device around the axis of the" bolt or pin e, whereas the smaller oscillations of the cable produced by the hi her harmonic oscillations or-vibrations Wlll efl'ect' a turning mo the axes of the pins or bolts dd or drZ in such a manner that an adjustment of the clamping parts inrelation to the slope of the conducting cable as well'as swingingmovements of the conducting cable itself become posslble without an undue wear and tear occurring.

In connection with high tension conduct ing cables mainly two kinds of mechanical v1brat1o ns w1ll occur, viz: the so-called'first harmonic or ground oscillations or vibrations, which have a small frequenc and a higher great amplitude, and the so-calle harmonic vibrations, which have a great frequency and a small'amplitude. The first harmonic oscillations will show great movements of'theconducting cable in contrast to the higher harmonic Vibrations, which small, practically invisible oscil1ations..' 0th" osclllations will take place no devices fordamping these oscillations were provided be reflected from the suspending device and would cause damage to the conducting cable.

For the purpose of avoiding these disadvantages there are arranged according to the present invention additional clamps a'a' connected to the receiving mould n by arms or plates 0'0. Said additional clamps aa can turn within said plates around the pins dd. They may be of such light weight that they can follow the small oscillations of the higher harmonic vibrations; on the other hand, however, their mass or Weight will be large enough so that, by receiving a turning movement from the small oscillations, they will efi'ect a damping of the same. The small oscillations of the higher harmonic vibrations will thus not be able to damping functions are performed similarly by the parts ibearing corresponding referencecharacters and designations.

It will readily be understood that various changes may be resorted to in the form, construction and arran ement of the several parts without departing from the spirit and scope of my invention, and hence I do not intend to be limited to the details herein shown and described except as they may be included in the claims.

What I claim is:

1. A suspending device for conducting cables comprising, a carrying member, carrying plates pivoted on the carrying member, and clamping devices pivoted in the carrying plates, the turning axis of the carrying plates in the carrying member and the turning axes of the clamping devices in turning axes of the clamping devices in said carrying plates lying practically in the middle line of the conducting cable, said clamp- I ng devices being mounted with their turning axes situate nearer their inner ends.

3. A suspending device 'for conducting cables comprising, a carrying member, carrying plates pivoted on the carrying member, and clamping devices pivoted in the carrying plates the turning axis of the carrying lates in the carrying member and the turning axes of the clamping devices in said carrying plates lying practically in the middle line of the conducting cable, said clamping devices being mounted with their turning axes situated nearer their inner ends and the cable-su porting surface of said clamping devices being formed as a convex curve in the portion inward from the point of mountin i. A suspending device for conducting cables comprising, a carrying member, a mould pivoted on the carrying member, carrying plates pivoted on clamping devices pivoted in the carrying plates, the turnin axes of the carryin plates in the moul and the turning axis 0 said mould in the carrying member lying practically in the middle line of the conducting cable.

In testimony that I claim the foregoing as my invention, I have signed 5th dig of December, 1929. JOH NNES WILHELM HOFMAN N.

the mould, andmy name this 

